visibility_shift

visibility_shift(uvw, vis, dl, dm)[source]

Shift visibilities by the given image-space distance. This is based on simple FFT laws. It will require kernels to be suitably shifted as well to work correctly.

Parameters

  • uvw –

  • vis – \((u,v,w)\) distribution of projected baselines (in wavelengths)

  • vis – Input visibilities

  • dl – Horizontal shift distance as directional cosine

  • dm – Vertical shift distance as directional cosine

Returns

New visibilities